Figure 1.

Effects of curcumin and PQ on cell viability. To determine appropriate experimental concentrations of curcumin and PQ, cells were treated with a series of curcumin (0–600 µmol/l) or PQ (0–20 µmol/l) concentrations. (A) WI-38VA13 cells were treated with different concentrations of curcumin (100, 300 and 600 µmol/l). (B) WI-38VA13 cells were treated with different concentrations of PQ (5, 10 and 20 µmol/l). Data are presented as the mean ± standard error of the mean (n=3). *P<0.05 and **P<0.01 vs. 0 h. Cur, curcumin; OD, optical density; PQ, paraquat.